<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <script src="three.js"></script>
  <style type="text/css">
    div#canvas-frame {
      border: none;
      cursor: pointer;
      width: 100%;
      height: 600px;
      background-color: #eee;
    }

  </style>
</head>
<body onload="threeStart();">
<div id="canvas-frame"></div>
<script>
  var renderer;
  function initThree() {
    width = document.getElementById('canvas-frame').clientWidth;
    height = document.getElementById('canvas-frame').clientHeight;
    renderer = new THREE.WebGLRenderer({
      antialias : true
    });
    renderer.setSize(width, height);
    document.getElementById('canvas-frame').appendChild(renderer.domElement);
    renderer.setClearColor(0xFFFFFF, 1.0);
  }

  var camera;
  function initCamera() {
    camera = new THREE.PerspectiveCamera(45, width / height, 1, 10000);
    camera.position.x = 0;
    camera.position.y = 1000;
    camera.position.z = 0;
    camera.up.x = 0;
    camera.up.y = 0;
    camera.up.z = 1;
    camera.lookAt({
      x : 0,
      y : 0,
      z : 0
    });
  }

  var scene;
  function initScene() {
    scene = new THREE.Scene();
  }

  var light;
  function initLight() {
    light = new THREE.DirectionalLight(0xFF0000, 1.0, 0);
    light.position.set(100, 100, 200);
    scene.add(light);
  }

  var cube;
  function initObject() {

    var geometry = new THREE.Geometry();
    var material = new THREE.LineBasicMaterial( { vertexColors: THREE.VertexColors} );
    var color1 = new THREE.Color( 0x444444 ), color2 = new THREE.Color( 0xFF0000 );

    // 线的材质可以由2点的颜色决定
    var p1 = new THREE.Vector3( -100, 0, 100 );
    var p2 = new THREE.Vector3(  100, 0, -100 );
    geometry.vertices.push(p1);
    geometry.vertices.push(p2);
    geometry.colors.push( color1, color2 );

    var line1 = new THREE.Line( geometry, material, THREE.LinePieces );
    scene.add(line1);

    // 线的材质可以由2点的颜色决定
    var p3 = new THREE.Vector3( -200, 100, 100 );
    var p4 = new THREE.Vector3(  200, 100, -100 );
    geometry.vertices.push(p3);
    geometry.vertices.push(p4);
    geometry.colors.push( color1, color2 );

    var line2 = new THREE.Line( geometry, material, THREE.LinePieces );
    scene.add(line2);
  }
  function render()
  {
    renderer.clear();
    renderer.render(scene, camera);
    requestAnimationFrame(render);
  }
  function threeStart() {
    initThree();
    initCamera();
    initScene();
    initLight();
    initObject();
    render();
  }

</script>
</body>
</html>
